Have you tried https://developers.google.com/sketchup/docs/ourdoc/image#path ?

Thanks - works perfectly.

cheers

@adamb said: @thomthom said: I did that for Vertex Tools, I take the average normal of the faces connected to the vertex. You're missing a step with your averaging there. You need to weight by the contribution each face connected to the vertex makes - ie weight by the interior angle otherwise a cube constructed of triangles will end up with vertex normals not all pointing out exactly at 45 degrees. How does one do that?

The default material is 'nil'. So face.material=nil makes face have no material and face.back_material=nil makes face have no back material You can get the color used for the two types of default face material from model.rendering_options["FaceFrontColor"] and model.rendering_options["FaceBackColor"] which both return a Color object, you can then get its RGB values in the normal way etc... You can also set these vales to a new color with []=